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    The Event class

    (PECL event >= 1.2.6-beta)

    简介

    Event class represents and event firing on a file descriptor being ready to read from or write to; a file descriptor becoming ready to read from or write to(edge-triggered I/O only); a timeout expiring; a signal occurring; a user-triggered event.

    Every event is associated with EventBase . However, event will never fire until it is added (via Event::add() ). An added event remains in pending state until the registered event occurs, thus turning it to active state. To handle events user may register a callback which is called when event becomes active. If event is configured persistent , it remains pending. If it is not persistent, it stops being pending when it's callback runs. Event::del() method deletes event, thus making it non-pending. By means of Event::add() method it could be added again.

    类摘要

    final class Event {
    /* 常量 */
    const int ET = 32;
    const int PERSIST = 16;
    const int READ = 2;
    const int WRITE = 4;
    const int SIGNAL = 8;
    const int TIMEOUT = 1;
    /* 属性 */
    public readonly bool $pending;
    /* 方法 */
    public add( float $timeout = ?): bool
    public __construct(
         EventBase $base ,
         mixed $fd ,
         int $what ,
         callable $cb ,
         mixed $arg = NULL
    )
    public del(): bool
    public free(): void
    public static getSupportedMethods(): array
    public pending( int $flags ): bool
    public set(
         EventBase $base ,
         mixed $fd ,
         int $what = ?,
         callable $cb = ?,
         mixed $arg = ?
    ): bool
    public setPriority( int $priority ): bool
    public setTimer( EventBase $base , callable $cb , mixed $arg = ?): bool
    public static signal(
         EventBase $base ,
         int $signum ,
         callable $cb ,
         mixed $arg = ?
    ): Event
    public static timer( EventBase $base , callable $cb , mixed $arg = ?): Event
    }

    属性

    pending

    Whether event is pending. See About event persistence .

    预定义常量

    Event::ET

    Indicates that the event should be edge-triggered, if the underlying event base backend supports edge-triggered events. This affects the semantics of Event::READ and Event::WRITE .

    Event::PERSIST

    Indicates that the event is persistent. See About event persistence .

    Event::READ

    This flag indicates an event that becomes active when the provided file descriptor(usually a stream resource, or socket) is ready for reading.

    Event::WRITE

    This flag indicates an event that becomes active when the provided file descriptor(usually a stream resource, or socket) is ready for reading.

    Event::SIGNAL

    Used to implement signal detection. See "Constructing signal events" below.

    Event::TIMEOUT

    This flag indicates an event that becomes active after a timeout elapses.

    The Event::TIMEOUT flag is ignored when constructing an event: one can either set a timeout when event is added , or not. It is set in the $what argument to the callback function when a timeout has occurred.

    目录

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